BL1: Add linker symbol identifying end of ROM content
This patch adds a new linker symbol in BL1's linker script named
'__BL1_ROM_END__', which marks the end of BL1's ROM content. This
covers BL1's code, read-only data and read-write data to relocate
in Trusted SRAM. The address of this new linker symbol is exported
to C code through the 'BL1_ROM_END' macro.
The section related to linker symbols in the Firmware Design guide
has been updated and improved.
Change-Id: I5c442ff497c78d865ffba1d7d044511c134e11c7
diff --git a/bl1/bl1.ld.S b/bl1/bl1.ld.S
index df9a799..be36b4e 100644
--- a/bl1/bl1.ld.S
+++ b/bl1/bl1.ld.S
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2013-2016, ARM Limited and Contributors. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
@@ -139,12 +139,14 @@
__DATA_ROM_START__ = LOADADDR(.data);
__DATA_SIZE__ = SIZEOF(.data);
+
/*
* The .data section is the last PROGBITS section so its end marks the end
- * of the read-only part of BL1's binary.
+ * of BL1's actual content in Trusted ROM.
*/
- ASSERT(__DATA_ROM_START__ + __DATA_SIZE__ <= BL1_RO_LIMIT,
- "BL1's RO section has exceeded its limit.")
+ __BL1_ROM_END__ = __DATA_ROM_START__ + __DATA_SIZE__;
+ ASSERT(__BL1_ROM_END__ <= BL1_RO_LIMIT,
+ "BL1's ROM content has exceeded its limit.")
__BSS_SIZE__ = SIZEOF(.bss);
diff --git a/bl1/bl1_private.h b/bl1/bl1_private.h
index 283bbb9..79dde73 100644
--- a/bl1/bl1_private.h
+++ b/bl1/bl1_private.h
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2013-2016, ARM Limited and Contributors. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
@@ -35,8 +35,11 @@
/*******************************************************************************
* Declarations of linker defined symbols which will tell us where BL1 lives
- * in Trusted RAM
+ * in Trusted ROM and RAM
******************************************************************************/
+extern uint64_t __BL1_ROM_END__;
+#define BL1_ROM_END (uint64_t)(&__BL1_ROM_END__)
+
extern uint64_t __BL1_RAM_START__;
extern uint64_t __BL1_RAM_END__;
#define BL1_RAM_BASE (uint64_t)(&__BL1_RAM_START__)